Assembler to English translation needed

[NovaCoder]

What value do I need to pass for a 320x200 screen using 'screenmode'?

;******************************************************************************

;void __asm indivision_initscreen(register __a0 ULONG indivisionfpgabase,
;				  register __d0 UBYTE screenmode)

_indivision_initscreen:
	movem.l a1-a2,-(sp)

	lea.l parameter_512x384(PC),a2
	cmp.b #$06,d0
	beq end_mode_select
	lea.l parameter_640x200(PC),a2
	cmp.b #$05,d0
	beq end_mode_select
	lea.l parameter_320x400(PC),a2
	cmp.b #$04,d0
	beq end_mode_select
	lea.l parameter_1024x768(PC),a2
	cmp.b #$03,d0
	beq end_mode_select
	lea.l parameter_800x600(PC),a2
	cmp.b #$02,d0
	beq end_mode_select
	lea.l parameter_640x400(PC),a2
	cmp.b #$01,d0
	beq end_mode_select
	lea.l parameter_320x200(PC),a2

end_mode_select:
	move.l a0,a1		; set up FPGA register bases
	add.l #$10,a1

	move.w #$0,(a0)		; unlock FPGA
	move.w #$fa50,(a1)

	move.w #$c0,d0		; clear video registers
clear_registers:
	move.w d0,(a0)
	move.l #$0,(a1)
	add.w #$1,d0
	cmp.w #$100,d0
	bne clear_registers

copy_display_params:
	cmp.w #$ffff,(a2)
	beq display_param_end
	move.w (a2)+,(a0)
	move.w (a2)+,(a1)
	bra copy_display_params	

display_param_end:
	move.w #$0,(a0)		; lock FPGA
	move.w #$0,(a1)

	movem.l (sp)+,a1-a2
	rts

parameter_320x200:
	dc.w $00c0,$0005,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$0190,$00d2,$01c1,$00d3,$0000,$00d4,$0030
	dc.w $00d5,$000c,$00d6,$000e,$00d7,$0048,$00d8,$013f
	dc.w $00d9,$0031,$00da,$018f,$00d0,$0005,$ffff,$ffff

parameter_640x400:
	dc.w $00c0,$0002,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$0320,$00d2,$01c1,$00d3,$0000,$00d4,$0060
	dc.w $00d5,$000c,$00d6,$000e,$00d7,$0090,$00d8,$027f
	dc.w $00d9,$0031,$00da,$018f,$00d0,$0001,$ffff,$ffff

parameter_800x600:
	dc.w $00c0,$0001,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$03ff,$00d2,$0270,$00d3,$0000,$00d4,$0048
	dc.w $00d5,$0001,$00d6,$0003,$00d7,$00c7,$00d8,$031f
	dc.w $00d9,$0017,$00da,$0257,$00d0,$0001,$ffff,$ffff

parameter_1024x768:
	dc.w $00c0,$0000,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$0530,$00d2,$0326,$00d3,$0018,$00d4,$00a0
	dc.w $00d5,$0003,$00d6,$0009,$00d7,$012e,$00d8,$03ff
	dc.w $00d9,$0025,$00da,$02ff,$00d0,$0001,$ffff,$ffff

parameter_320x400:
	dc.w $00c0,$0005,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$0190,$00d2,$01c1,$00d3,$0000,$00d4,$0030
	dc.w $00d5,$000c,$00d6,$000e,$00d7,$0048,$00d8,$013f
	dc.w $00d9,$0030,$00da,$018f,$00d0,$0001,$ffff,$ffff

parameter_640x200:
	dc.w $00c0,$0002,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$0320,$00d2,$01c1,$00d3,$0000,$00d4,$0060
	dc.w $00d5,$000c,$00d6,$000e,$00d7,$0090,$00d8,$027f
	dc.w $00d9,$0031,$00da,$018f,$00d0,$0005,$ffff,$ffff

parameter_512x384:
	dc.w $00c0,$0001,$00c1,$0000,$00c2,$0001,$00c5,$0000
	dc.w $00d1,$0298,$00d2,$0326,$00d3,$000c,$00d4,$0050
	dc.w $00d5,$0003,$00d6,$0009,$00d7,$0096,$00d8,$01ff
	dc.w $00d9,$0025,$00da,$02ff,$00d0,$0005,$ffff,$ffff

[phx]

The source is incomplete. Unfortunately it ends exactly at the most interesting point.

When I should guess I would try it with screenmode=0.